KR20030062339A - Clear soap bar - Google Patents

Abstract

The present invention relates to a transparent soap bar formulation based on sodium cocoyl isethionate (SCI) and a method for preparing the transparent soap bar. Soap bar formulations use SCI prepared using metal catalysts (eg, zinc) to facilitate the production of SCI faster and more economically. The clear soap bar is formed from a premix of propylene glycol, sorbitol, sodium lauryl ether sulfate (SLES), glycerin, water, stearic acid and myristic acid. Sodium hydroxide is added to saponify the fatty acids to form a soap. The resulting mixture is stirred until homogeneous and chelating agent is added. The mixture is stirred until it is homogeneous again. Then SCI is added and the mixture is stirred until it is almost clear. The mixture is then left without stirring for a period of time to allow air bubbles to rise to the top of the vessel. The mixture is poured into a mold and cooled without interruption. Transparent soap bar formulations may also contain one or more conventional soap bar adjuvants, including but not limited to foam stabilizers, humectants, emollients, fragrances and chelating agents.

Description

Clear soap bar {Clear soap bar}

Field of invention

The present invention relates generally to soap bars and, more particularly, to methods of making transparent soap bars made from sodium cocoyl isethionate.

Background of the Invention

Soaps have conventionally been prepared from fatty acids, such as Uji group fats, which dissolve simultaneously in both surfactant properties, i.e., in the aqueous and organic phases. This dual property allows the surfactant to clean dirt and oil from the surface to produce soap bubbles. The main surfactant used in soap bars is the sodium salt of fatty acids.

Soap bar formulations are becoming increasingly complex due to changes in consumer bathing habits and emphasis on the marketability of soap bars for such consumers. For example, milder soaps have been made because consumers bathe more often than in the past. The performance of soap bars is assessed in addition to non-irritant to the skin, by soap bubbles, wet cracks, firmness and cleansing. To improve the performance of soap bars and provide additional consumer benefits, they include free fatty acids, glycerol, colorants, dyes, pigments, fragrances, chelating agents, antioxidants, irritant skin additives, antimicrobial agents and synthetic surfactants. Various additives can be formulated into soap bars.

Synthetic surfactants typically have low sensitivity to water hardness, which results in soap bar formulations with improved cleansing properties, lather and general "feel to skin". Anionic surfactants such as sodium cocoyl isethionate: SCI are commonly used as synthetic surfactants in soap bar formulations. SCI is a milder surfactant, but soap bars incorporating SCI are more expensive than conventional simple soaps.

Recently, clear or transparent soap bars have become increasingly popular among consumers. For example, transparent soap bars aesthetically pleasing to the eye of the consumer and also provide cleaning properties typically associated with opaque or translucent soap bars. Transparent soap bars have been made from SCI, but only SCI prepared with organic acid catalysts provide good transparency. The use of organic acid catalysts can cause problems in the preparation of SCI, leading to longer reaction times or lower activity levels than can be achieved with inorganic catalysts, resulting in higher SCI per pound of active substrate.

Therefore, what is needed is a clear soap bar that can be prepared from SCI containing or prepared using an inorganic catalyst, which is economical and faster than SCI prepared using organic acid catalysts.

Summary of the Invention

The present invention relates to a transparent soap bar formulation based on sodium cocoyl isethionate (SCI) and to a method of making the transparent soap bar. The soap bar formulations invented promote faster and more economical production of SCI using SCI prepared using zinc catalysts. In a preferred embodiment, tetrasodium ethylene diaminetetraacetic acid (EDTA) is added to the formulation according to the zinc content of the soap bar formulation and the opacity is removed to produce a substantially transparent soap bar. Based on the zinc content, EDTA is added to the soap bar formulations preferably from about 1: 1 to about 5: 1 by weight. The clear soap bar formulations of the present invention may also contain one or more conventional soap bar adjuvants, including but not limited to foam stabilizers, humectants, emollients and fragrances.

In one embodiment, the clear soap bar of the present invention is formed from a premix of propylene glycol, sorbitol, sodium lauryl ether sulfate (SLES), glycerin, water, stearic acid and myristic acid. The premix is stirred and heated, then sodium hydroxide is added to saponify the fatty acids to form a soap. The resulting mixture is stirred until homogeneous and EDTA is added. The mixture is stirred until it is homogeneous again. Then SCI is added and the mixture is stirred until it is substantially clear. The mixture is then left without stirring for a period of time to allow air bubbles to rise to the top of the vessel. The mixture is poured into a mold and cooled without interruption.

The process for preparing the transparent soap bar comprises the steps of forming a mixture of propylene glycol, sorbitol, SLES, glycerin, water, stearic acid and myristic acid in a container; Heating the mixture to a temperature of about 45 ° C. to about 65 ° C .; When the mixture is completely melted, slowly adding NaOH while maintaining the temperature of the mixture at about 65 to about 75 ° C .; stirring the mixture until substantially homogeneous; Based on zinc content in SCI. Adding EDTA to the mixture in a weight ratio of about 1: 1 to about 5: 1; Stirring the mixture until the mixture is substantially homogeneous; Adding SCI, stirring the mixture until the mixture becomes substantially homogenous and the SCI dissolves at a temperature of about 65 to about 75 ° C. and stirring for about 60 to about 120 minutes; Leaving air bubbles in the mixture to rise to the surface; Pouring the mixture into a mold having a temperature of about 65 to about 75 ° C. and cooling the mixture without interruption.

The present invention is a transparent soap bar based on sodium cocoyl isethionate (SCI), which is more economical and faster to manufacture than conventional soap bars based on SCI. In addition, the present invention is a transparent soap bar based on SCI, wherein SCI need not be prepared from an organic catalyst. The clear soap bar of the present invention is softer than conventional soaps and can be used by individuals on a regular basis. The clear soap bar of the present invention comprises a basic mixture of propylene glycol, sorbitol, anionic surfactant, glycerin, water, stearic acid and myristic acid. Sodium hydroxide, chelating agent and SCI are added to the base mixture according to the process of the invention, which is mentioned in more detail below.

Transparent soap bar formulations may optionally include, but are not limited to, conventional soap bar adjuvants, including foam stabilizers, humectants, emollients, fungicides and fragrances. Examples of foam stabilizers include alkyl monoethanolamides, alkyl diethanolamides, acyl sarcosinates, acyl taurates, acyl isethionates, acyl lactates, alkyl amine oxides, alkyl betaines, alkyl ether carboxylates, acyl glutamate and Mixtures thereof. Examples of humectants include glycerin, propylene glycol, butylene glycol, polyethylene glycol and mixtures thereof. Examples of emollients include mineral oils, vegetable oils, silicone oils, synthetic and semisynthetic emollient esters, and mixtures thereof.

Ethylene diaminetetraacetic acid (EDTA) is preferably used as the chelating agent. Examples of other chelating agents include sodium sodium diethylenetriamine pentaacetic acid (DTPA), sodium ethidronate (EDHP) and citric acid. The clear soap bar may also include non-irritating skin additives such as lanolin, vitamin E, aloe vera gel and panthenol.

In one embodiment, the clear soap bar of the present invention is formed from a preliminary mixture of propylene glycol, sorbitol, anionic surfactants (eg sodium lauryl ethyl sulfate; SLES), glycerin, water, stearic acid and myristic acid. The premix is mixed and heated, then sodium hydroxide is added to saponify the fatty acids to form a soap. The resulting mixture is stirred until homogeneous and chelating agents (eg EDTA) are added. The mixture is stirred until it is homogeneous again. Next, SCI is added and the mixture is stirred for a period of time until it is substantially clear with the addition of SCI about 1 to about 2 hours before stopping the stirring of the mixture and the mixture is left to stand. The treated mixture is poured into molds and cooled without interruption.

Table 1 below is a preferred embodiment of the components and amounts of the present invention.

Formulations and Preferred Ranges (wt% Composition) ingredient Full range Desirable range More desirable range Most desirable range A Propylene glycol 8.0 to 22.0% 10.0 to 20.0% 12.0 to 18.0% 14.0 to 16.0% Sorbitol (70%) 8.0 to 16.0% 10.0 to 15.0% 11.0 to 14.0% 12.0 to 13.0% SLES (60 wt% / EtOH) 16.0 to 27.0% 18.0 to 25.0% 19.0 to 23.0% 20.0 to 21.0% glycerin 10.0 to 15.0% 11.0 to 14.0% 12.0 to 14.0% 13.0 to 14.0% water 2.0 to 4.0% 2.0 to 4.0% 3.0 to 4.0% 3.0 to 4.0% Stearic acid 13.0 to 15.0% 13.0 to 15.0% 14.0 to 15.0% 14.0 to 15.0% Myristic acid 6.0 to 7.0% 6.0 to 7.0% 6.0 to 7.0% 6.0 to 7.0% B Sodium Hydroxide (50%) 6.0 to 7.0% 6.0 to 7.0% 6.0 to 7.0% 6.0 to 7.0% EDTA 0.10 to 1% 0.10 to 0.8% 0.10 to 0.5% 0.2 to 0.3% Hostaphone ^R SCI 85 3.0 to 6.0% 3.0 to 5.5% 3.0 to 5.5% 4.0 to 5.0% Acid Plate ^R LS24N 0 to 5.0% 0 to 4.5% 0 to 4.0% 0 to 3.5% TEA or ammonium hydroxide 0 to 1.5% 0-1.25% 0 to 1.0% 0 to 1.0%

The process for preparing a transparent soap bar comprises forming a soap bar mixture of propylene glycol, sorbitol, anionic surfactant (eg SLES), glycerin, water, stearic acid and myristic acid (Table 1, component A) in a container; Heating the mixture to a temperature of about 45 ° C. to about 65 ° C .; When the mixture is completely melted, slowly adding NaOH (Table 1, Component B) while maintaining the temperature of the mixture at about 65 to about 75 ° C .; Stirring the mixture until substantially homogeneous; Adding EDTA (Table 1, Component C) to the mixture in a weight ratio of about 1: 1 to about 5: 1 based on the amount of metal catalyst (eg, zinc component) in the SCI; Stirring the mixture until the mixture is substantially homogeneous; SCI (Hostapon ^R SCI 85; From Clariant Corporation, Charlotte, NC, USA (Table 1, component D), the mixture is substantially transparent and homogeneous, and the SCI is dissolved at a temperature of about 65 to about 75 ° C. Stirring until; Sodium laureth-13-carboxylate (Sandopan ^R LS24N; From Clariant Corporation, Charlotte, NC, USA (Table 1, Component D), and stirring until the mixture is homogeneous; Adding triethanolamine (TEA) (Table 1; component E) and stirring for about 60 to about 120 minutes; Stopping stirring and allowing the air bubbles in the mixture to rise to the surface; Pouring the mixture into a mold having a temperature of about 65 to about 75 ° C. and cooling the mixture without interruption.

In a preferred embodiment, all the components of A are mixed in a vessel and heated to a temperature of about 45 to about 65 ° C. Once the acid of component A has completely melted, NaOH is added slowly to the mixture as dropwise to adjust the exotherm during saponification, preferably to 70 ° C. ± 5 ° C. or less. The mixture is mixed well at the same temperature until homogeneous, preferably for about 30 minutes. EDTA is then added and the mixture is stirred for several minutes until substantially homogeneous. Subsequently, SCI 85 is added. The mixture is preferably stirred until it is substantially clear at a temperature of about 70 ° C. ± 5 ° C. for about 30 minutes when using powdered SCI 85 or about 60 minutes when using chipped SCI 85. Sodium laureth-13-carboxylate (acid plate ^R LS24N) (D) is then added. The mixture is stirred until the mixture is homogeneous. TEA (E) is then added and the mixture is stirred for about 60 to about 120 minutes. Turn off the stirrer and allow air bubbles to rise to the top of the flask for about 30 minutes. The mixture is then poured into a mold having a temperature of about 70 ° C ± 5 ° C. Allow the bar to cool without interruption. Once cooled, the bar is removed from the mold and packed.

Upon stirring after addition of the above-mentioned TEA, extending the stirring time at high temperature tends to discolor the final bar, and if the stirring time is too short, a slightly opaque bar is obtained. Two hours of stirring after the addition of all ingredients is sufficient to achieve the desired transparency without discoloring the mixture in air. Chelating agents include, but are not limited to, DeQuest 2066 (AS # 22042-96-2, also known as ethylenediaminetetraacetic acid, disodium salt dihydrate, diammonium salt of ethylenediaminetetraacetic acid, ethylenetriaminepentaacetic acid, phosphonic acid). ), [(Phosphonomethyl) imino] bis [(2,1-ethanediylnitrilo) tetrakis (methylene)] tetrakis-sodium salt and DTPA.

Other components include mild surfactants such as alkyl ether carboxylates, acyl glutamate and ampoacetates. Ammonium hydroxide can be substituted for TEA. Other additives customary for conventional soap bars may also be added to the soap bar mixture, including but not limited to preservatives, dyes, fragrances, vitamins such as vitamin E, vegetable extracts, panthenol, and conditioning polymers. .

Example 1 Hostaphone Without EDTA ^R SCI 85

Example 1 described what results are achieved in a soap bar made without the chelating agent, based on the content of the catalyst in the SCI, in the weight ratio range of 1: 1 to 5: 1. Weigh the following components directly into a 1 L reaction flask using a laboratory analytical balance:

200 g propylene glycol

150 g of sorbitol (70%)

175 g of SLES (60 wt% / EtOH)

Glycerin 135g

27 g of water

130 g stearic acid

60 g of myristic acid

Set up a heating jacket and stirrer in the flask. Seal the flask to minimize moisture loss during the process. The stirrer is operated at high speed and the flask is heated to 59 ° C. Once the acid has melted, 60 g of sodium hydroxide (50%) begins to be added dropwise very slowly to adjust the exotherm to 70 ° C. or less during saponification. Mix well at the same temperature until homogeneous (approximately 30 minutes), add 50 g of SCI 85 powder and stir for approximately 30 minutes until the mixture becomes clear at 70 ° C. Add 10 g of TEA and stir for 60 minutes. Turn off the stirrer, allow air to rise to the top of the flask (approximately 30 minutes) and pour into 70 ° C bar mold. Allow the bar to cool without interruption. Once cooled, the bar is removed from the mold and packed. The resulting cooling bar is not transparent but is not 100% opaque.

Example 2 Hostaphone with EDTA ^R SCI 85

Example 2 shows how the addition of a sufficient amount of chelating agent aids in the clarification of the soap bar produced. Weigh the following components directly into a 1 L reaction flask using a laboratory analytical balance:

200 g propylene glycol

150 g of sorbitol (70%)

175 g of SLES (60 wt% / EtOH)

Glycerin 135g

27 g of water

130 g stearic acid

60 g of myristic acid

Set up a heating jacket and stirrer in the flask. Seal the flask to minimize moisture loss during the process. The stirrer is operated at high speed and the flask is heated to 59 ° C. Once the acid has melted, 60 g of sodium hydroxide (50%) begins to be added dropwise very slowly to adjust the exotherm to 70 ° C. or less during saponification. Mix well at the same temperature until homogeneous (approximately 30 minutes) and add 3 g of EDTA. The mixture is mixed for several minutes to homogenize again, 50 g of SCI 85 powder is added and then stirred for approximately 30 minutes until the mixture is completely clear at 70 ° C. Add 10 g of TEA and stir for about 60 minutes. Turn off the stirrer, allow air to rise to the top of the flask (about 30 minutes), then pour into 70 ° C bar mold. Allow the bar to cool without interruption. Once cooled, the bar is removed from the mold and packed. The resulting cooling bar is transparent.

Example 3-Acid Plate ^R Host phone with EDTA mixed with LS24N ^R SCI 85

Example 3 shows how the addition of a sufficient amount of chelating agent aids in the clarification of the soap bar produced. Weigh the following components directly into a 1 L reaction flask using a laboratory analytical balance:

Propylene Glycol 180g

120 g of sorbitol (70%)

205 g of SLES (60 wt% / EtOH)

1.0 g of vitamin E

2.5 g of jojoba oil

Panthenol 1.0g

Glycerin 120g

31.5 g of water

130 g stearic acid

60 g of myristic acid

Set up a heating jacket and stirrer in the flask. Seal the flask to minimize moisture loss during the process. The stirrer is operated at high speed and the flask is heated to 59 ° C. Once the acid has melted, 60 g of sodium hydroxide (50%) begins to be added dropwise very slowly to adjust the exotherm to below 70 ° C. during saponification. Mix well at the same temperature until homogeneous (approximately 30 minutes) and add 4 g of EDTA. Mix for several minutes until homogeneous again, add 50 g of SCI 85 powder, and stir until the mixture is sufficiently clear at 70 ° C. Add 35 g of acid plate ^R LS24N and stir for about 90 minutes. Turn off the stirrer, allow air to rise to the top of the flask (about 30 minutes), then pour into 70 ° C bar mold. Allow the bar to cool without interruption. Once cooled, the bar is removed from the mold and packed. The resulting cooling bar is transparent.

Example 4-Acid Plates with and Without EDTA ^R LS24N

Example 4 demonstrates that the addition of a sufficient amount of EDTA has a useful effect on soap bars made without the addition of Hostapon ^R SCI 85. Set up the dual reaction flask. Weigh the following components directly into a 1 L reaction flask using a laboratory analytical balance:

200 g propylene glycol

150 g of sorbitol (70%)

175 g of SLES (60 wt% / EtOH)

Glycerin 135g

27 g of water

130 g stearic acid

60 g of myristic acid

Set up a heating jacket and a stirrer in each flask. Seal the flask to prevent moisture loss during the process. The stirrer of each flask is operated at high speed and heated to 59 ° C. When the acid in each flask melts, 60 g of sodium hydroxide (50%) is added dropwise very slowly to adjust the exotherm during saponification to preferably below 70 ° C. Mix well at the same temperature until homogeneous (approximately 30 minutes) and add 3 g of EDTA to one of the flasks. Continue mixing the two flasks for several minutes to allow the flask with EDTA to become homogeneous again, then add 50 g of pH plate ^R LS24N to each of the two flasks and stir for about 30 minutes until the mixture is completely clear at 70 ° C. do. 10 g of TEA is added to each of the two flasks and stirred for 60 minutes. Turn off the stirrer, allow air to rise to the top of the flask (30 minutes), then pour into a 70 ° C. bar mold. Allow the bar to cool without interruption. Once cooled, the bar is removed from the mold and packed. The resulting cooling bar is transparent, but the transparency is improved by the addition of EDTA.

Since the description of the specific aspect fully refers to the general characteristics of the present invention, it is possible to apply the common knowledge to easily adapt such specific aspect for modification and / or various applications without departing from the general concept, and accordingly Such applications and modifications are to be understood and understood within the meaning and scope equivalent to the described embodiments.

It is to be understood that the phraseology or terminology used herein is for the purpose of description and should not be regarded as limiting. Accordingly, the present invention is intended to embrace all such alterations, modifications, equivalents, and variations as long as they come within the spirit and broad scope of the appended claims.

Claims (12)

Basic mixtures comprising propylene glycol, sorbitol, anionic surfactants, glycerin, water, stearic acid and myristic acid; Sodium hydroxide; Clear soap bar composition comprising sodium cocoyl isethionate (SCI) and a sufficient amount of chelating agent in a weight ratio ranging from about 1: 1 to about 5: 1 based on the amount of metal catalyst present in the SCI bar composition). The chelating agent of claim 1, wherein the chelating agent is ethylenediaminetetraacetic acid (EDTA), disodium salt dihydrate, disoammonium salt of ethylenediaminetetraacetic acid, tetrasodium ethylenediaminetetraacetic acid, ethylenetriaminepentaacetic acid, phosphonic acid, [(force Phonomethyl) imino] bis [(2,1-ethanediylnitrilo) tetrakis (methylene)] tetrakis-sodium salt and sodium sodium diethylenetriamine pentaacetic acid (DTPA) Composition. The transparent soap bar composition of claim 1, wherein the anionic surfactant is selected from the group consisting of sodium lauryl ether sulfate (SLES), alkyl ether carboxylates, acyl glutamate, ampoacetate, and mixtures thereof. The composition of claim 1, wherein the propylene glycol is about 8 to about 22 weight percent, the sorbitol is about 8 to about 16 weight percent and the anionic surfactant is about 16 to about 32 weight percent based on the weight of the composition Glycerin is about 10 to about 15 weight percent, water is about 2 to about 4 weight percent, stearic acid is about 13 to about 15 weight percent, myristic acid is about 6 to about 7 weight percent, sodium hydroxide is about 6 to about 7 weight percent, chelating agent about 0.1 to about 1 weight percent, SCI is about 3 to about 6 weight percent transparent soap bar composition. Basic mixtures comprising propylene glycol, sorbitol, anionic surfactants, glycerin, water, stearic acid and myristic acid; Sodium hydroxide; Sodium cocoyl isethionate (SCI), a sufficient amount of chelating agent and triethanolamine (TEA) and ammonium hydroxide in a weight ratio ranging from about 1: 1 to about 5: 1 based on the amount of metal catalyst present in the SCI A transparent soap bar composition comprising one, wherein the SCI is SCI zinc catalyst prepared. The composition of claim 6, wherein the propylene glycol is about 8 to about 22 weight percent, the sorbitol is about 8 to about 16 weight percent and the anionic surfactant is about 16 to about 32 weight percent based on the weight of the composition Glycerin is about 10 to about 15 weight percent, water is about 2 to about 4 weight percent, stearic acid is about 13 to about 15 weight percent, myristic acid is about 6 to about 7 weight percent, sodium hydroxide is about 6 to about 7 percent by weight, chelating agent about 0.1 to about 1 percent by weight, SCI about 3 to about 6 percent by weight, and one of TEA and ammonium hydroxide is 0 to about 1.5 percent by weight. Forming in the vessel a mixture of propylene glycol, sorbitol, anionic surfactant, glycerin, water, stearic acid and myristic acid; Heating the mixture to a temperature of about 45 ° C. to about 65 ° C .; When the mixture is almost melted, slowly adding NaOH while maintaining the temperature of the mixture at about 65 to about 75 ° C .; After adding NaOH, stirring until the mixture is substantially homogenous; Adding a chelating agent to the mixture in an amount of from about 1: 1 to about 5: 1 weight ratio based on the metal catalyst in the SCI; After adding the chelating agent, stirring the mixture until the mixture is substantially homogenous; Adding SCI, stirring the mixture until the mixture is substantially homogenous and the SCI is dissolved; Adding one of TEA and ammonium hydroxide to the mixture and stirring for about 60 to about 120 minutes; Stopping the stirring and leaving the air bubbles in the mixture rise to the surface without stirring; Pouring the mixture into a mold having a temperature of about 65 to about 75 ° C. and cooling the mixture without interruption. The method of claim 7 wherein the adding step of the chelating agent is carried out using an chelating agent in an amount of about 0.1 to about 1% by weight. 8. The method of claim 7, wherein the step of adding SCI is carried out at a temperature of about 65 to about 75 ° C. The method of claim 7 wherein the step of mixing the mixture after addition of NaOH is carried out at a temperature of about 65 to about 75 ° C. for about 30 minutes. The method of claim 7, wherein the step of stirring the mixture after addition of the chelating agent is performed for at least 2 minutes. The method of claim 7, wherein adding and stirring SCI is performed at a temperature of about 65 to about 75 ° C. for about 30 to about 60 minutes.